Diamond die drilling machine



M y 1947- A. VAN DEN BERG ETAL 2,420,920

DIAMOND DIE DRILLING MACHINE 4 ShQetS -Sheet 1 Filed Sept 5, 1944 v mu mm mm mm an Hm an 2 \w a a.

INVENTORS BY 4'7 Zfiumf ANTONIUS WWBERG a MROZDJQE'NYON ATTORNEY y 1947- A. VAN DEN BERG ETAL 2,420,920

DIAMOND DIE DRILLING MACHINE 4 Shoet-Sheet 2 Filed Sept. 5, 1944 mmvrom BY/ar 14 AT 1' 021m? \NJN MN w a MOLD KZZWON ANT 01V] US mmBEIZG N Qx 7 1947- A. VAN DEN BERG ETAL 2 2,420,920

DIAMOND DIE DRILLING MACHINE Filed Sept. 5, 1944 4 Sheets-Sheet 3 32 17- 18 'i 52 lg 14 14 L6 ANTOMUS mmNBERG HAROLDAKEIVYOJVV INVENTORS ATTORMK y 1947- A. VAN DEN BERG ETAL 2,420,920

DIAMOND DIE DRILLING MACHINE 7 Filed Sept. 5, 1944 4 Sheets-Shoat 4 l INVENTORS mom Patented May 20, 1947 e r DIAMOND DIE DRILLING MACHINE Antonius C. van den Berg and Harold Kenyon,

Blackburn,

England, assignors to The Hartford National Bank and Trust Company,

as trustee Application September 5, 1944, Serial No. 552,780

In Great 1 This invention relates to drilling machines of the kind in which an abrasive medium is applied ,to the contoured drilling point of a drill. Such machines are for example used for drilling diamonds for use as wire drawing dies. machines, the drilling tool is in the form of a .rapidly rotating drill, e. g. a steel needle, the

point of which is given the configuration which is desired in the finished hole and which is charged with an abrasive, such as oil'containing diamond dust. The drilling operation is performed by axially reciprocating the support carrying the work sons to bring the latter into and out of engagement with the rotating drill or needle.- Owing to the wear to which the drill is subjected, it needs to be restored to shape 'at comparatively frequent intervals, by the use of a rotating grinding or lapping wheel. During this re-shaping operation the work support has to be retracted from its normal working position so that the grinding wheel has free access to the point of the drill.

According to the present invention for restoring the shape of the drill'of a drilling machine of the kind referred to, comprising a. rotating drill and a reciprocating work support, the work support is mechanically retracted and the grinding or lapping wheel is mechanically advanced to engage the drill, both mechanical movements being derived from the main drive of the machine. Preferably a cam shaft is provided which is driven from the main drive. This cam shaft carries two cams, one of which eflects the retraction of the work support. and the other of which effects the advance of the grinding wheel. Advantageously the work support is spring urged towards the drill and the reciprocation is eiiected by means of a cam operated rocking lever which engages a projection on the work support. With this arrangement the retraction necessary for the operation of restoring the shape of the drill can be occasioned by imparting an additional displacement to the rocking lever. 1

Existing drilling machines of this kind and comprising a rotating drill and a reciprocating work support can readily be converted into machines in accordance with the present invention by the incorporation of an attachment compris 2 ing a cam shaft with suitable gearing for driving 7 thedrill- I.

the cam shaft from the main drive of the ma chine, the cam shaft being provided with two In such 7 vance the latter towards the drill.

Britain September 29, 1943 Claims. (01.125-30) engage a support for the grinding wheel to ad- In arrangements according to the present invention, it is preferred to employ a grinding or lapping wheel of cylindrical form mounted with its axis in a. plane at right angles to the axis of the drill, but for some purposes it may be desirable to dispose the grinding wheel with its axis parallel with or inclined to the axis or the drill, and/or touse anon-cylindrical wheel.

In order that the invention may be more readily understood reference will now be had to the accompanying drawings which show a preferred constructional form of a machine for drilling 7 movement.

cams, one of which engages a rocking lever adapted to impart movement to the work sup port to retract it from the drill and the other new engaging a. second rocking lever mounted to and Il the mount hunt with the drill i.

diamonds for use as wire drawing dies and in which Fig. 1 is a side elevation of the machine. Fig. 2 isa plan view. Fig. 3 is a perspective site to Fig. 1.

Fig. 4 is a detail view substantially on the line IV -IV of Fig. 1.

Fig. 5 is a perspective view of part of Fig. 1. The drill or needle I (Fig. 1) is mounted in view from the side oppoa chuck 2 carried on a shaft 3 which is iournalled in bearings 4 in bracket members 'I integral with the main frame 01 the machine. The bearings 4 have to be preciseiyaligne'd and adiimted so that the drill l rotates precisely about its own. 1 axis without detectable lateral movement. The I spindle 3 is drivenby way of. a pulley 5 and a. driving cord 6 passing over the pulley 5v and -'Ihedia- 1 mond 8 (Fig.2) which is to be drilled to iorm die is'mounted on a support 8. which-is carried in grooved rollers ill, rotatably round a driving pulley (not shown).

the wire drawing supported on bearing pins II. ,The bearing pins II have to be adjusted to permit. free rotation of the rollers III with their grooved suriaees'in precise and the rollers III is supported on the main frame of the machine by means or levelling screws l3 (Fig. 1), and is lockedby means of lateral ,ad-.

By means of the screws l3. I! can be adjusted so that the I diamond support 9 moves precisely in axial align- Engaging a clip I! on the lusting screws l'l.

rear end oi the diamond support 8 is a spring ll, which tends to urge the diamond 8 towards. ,Theotherend' oi the spring 16 is secured in an anchor II, which isadiustably mounted on .a e as to which it is clamped y a spring. clamp l9.

rvarlfu t s the anchor il lengthwise of the red It the tenalignment and without detectable lateral The mount it carrying the pins H the position or v sion of the spring can be varied. The diamond support 9 carries a downwardly projectingpin' rotation of the diamond mount 9 during the drilling operation without impeding the free movement of the diamond support in the axial direction.

The'reciprocation of the diamond support 9 in the axial direction during the drilling operation is' occasioned by means of a rocking lever 22 one end of which engagesthe: pin. 20 so-as to move the diamond support 5 away from the drill I against the action of the spring l6. Themovement of the lever 22 is so controlled that in its forward position it is clear of the pin 20, so that the diamond 8 is held against the drill l by the actionof the spring II.- The lever 22 is mounted on a pivot pin 23 (Fig. 4) which is substantially vertical and in the construction shown has conical bearing ends received by adjustable centres 24. By careful-adjustment of the centres the pivot pin 23 can be set to rotate freely without lateral movement; The lever 22 "mg. 5) is provided at the and remote from the pin 20 with a pivotedsection 25 which is "urged upwardly by means of a spring against an adjusting screw 25. The free end of the lever section 25 carries screw 21 which is adiust- 1 able and which has a hardened point engaging the'hardened surfaceof a face cam 2l. This cam'28 is carriedona shaft 29 journalled' in a bearing bracket 38 and also carrying a stepped pulley 3i enabling the cam 28 to be rotated by a driving belt 22. The spring 33 (Fig. 4 and Fig. 5) is'anchored in one of the centres 2| "24 also serves. to lock these screws against undesired movement. Durlngthe rotation of the face cam 28 (Fig. 2) the pin 21 causes the lever 22 to pivot about the pin 23 and consequently equivalent movement is imparted by way of the pin 2|) to'the'diamond supportt. By means of the 4 it is necessary to be able to restore the shape of the point of the drill periodically. The mechanism for retracting the diamond support 9 to enable the re-shaping to be performed and for advancing the grinding or lapping wheel which is to perform the re-shaping operation will now .be described.

Mounted on the pivotal assembly constituted by the arm 35 (Fig. 4 and Fig. 5) and the bracket 30 is a transverse shaft 40 which has a rigidly attached upwardly extending arm 4! which engages the end of the previously mentioned screw 34; Also rigidly attached to the shaft 40 is a downwardly extending arm 42, the extremity of which is adapted to engage the face cam 48 (Fig. 1). The shaft 40 (Fig. 4) is associated with a spring 43 tending to hold the lever 4i out of supporting brackets 46. The cam shaft is driven by means of a driving chain 41 which also passes over a driving wheel (not shown) driven from the main drive by way of a suitable reduction gear. In the rotation of the cam shaft 44 the face cam 48 engages the arm 42 thereby rocking the shaft 40 (Fig. 4 and Fig. 5) so as to bring the lever 4| into engagement with the adjustable screw 34 to pivot the lever 22 on its pivot pin 23, whereby due to the engagement of the lever 22 with the pin 20 the diamond support 9 is retracted clear from the'drill l. Simultaneously the end of the adjustable screw 21 is lifted out of engagement with the 'face cam 28 so that v drawings.

the normal reciprocating movement is suspended.

This position is shown in Figs. 1 and-2 of the 7 When the diamond support 9 is in this retracted position the re-shaping operation can be performed on the drill I. For this purpose the cam shaft M (Fig.1 and Fig. 5) carries I a second cam 49 which is a radial cam "and which is engaged by a transversely extending cam lever 50. This lever is pivoted-between its ends on a pivot 5i, and the,.end remote from the cam 49 engages the lower end of a vertical column 52 which is slidable in a guide 53. In the rotation of the cam 49 the lever 5|) is rocked with consequent vertical'movement of the columnjf. Clamped to the upper end of the col- 52 (Fig. 3) by means of a clamp 54 is a I ,fork 55 carrying the grinding or lapping cylinadjusting screw (Fi 4 and Fig. 5) the distance of the pin 211mm the centre of the" cam 25 can be adiusted with corresponding ad-, Justment of the throw ofthe lever 22. Intthis way the diamond support 5 is continuously oscillated towards and away from the drill I so that the drilling operation can take place in the desired manner. The bracket (Fig; 1) and l the .carrier for the centres 24 (Fi 4) are both ,mounted at the free end of ja bifurcated lever which is pivotally mounted 'on ashaft 35 (Fig.

l I The shaft ll is secured in a fixed ouarlrant 31- (Fla. 4) which is bolted to t e main frame by means of bolts 32., The arm 25 is secured in the desired position by means of a clamping bolt 25 passing through an arcuate slot in the quadrant 21. In this way the mechanismior der 58. The fork is preferably pivotally r mounted to the upper end of the column 52 so that it can be..adjusted in relation to the end of the drill I. By means of the clamp 54 the fork 55 is firmly securedr in'the desired podtion. The lapping cylinder 55 (Fig. 2) is secured on a shaft 58 which also carriesa driving pulley 51. The ends of the shaft 55 are in the form ot-cones running in centres 59., These bearings .have to be adjusted with great precision so as to obtain free rotation without lateral movereciprocatingthe diamond support 5 can be ad-j' justed in relation to the dissnondysrmnort and can also. if desired. be pivoted into an inopera-' tive position in which the clamping bolt 35 occupies theouter slide! the slot in the quadrant 51. Owing to the wear to which the point of the ment. The driving pulley 51 is engaged by a driving belt at which is driven from a suitable driving Pulley (not shown). Preferably the drivto the shaft 55.

With the re-shaping arrangements as dedrill I issubiectedduring the drilling operation, scribed, he e r on t e cy nd 50 i ca d substantially at one point. It .is therefore desirable that provision should be made for brings ing different parts of the lapping cylinder 58 into the operative position. In the arrangement as shown this can be done by adiusting the centres 59 in which the shaft 58 runs. The lapping cylinder 56 can conveniently take the form of a copper cylinder in the surface on which diamond dust is embedded.

In the construction as hereinbefore described with reference to the drawings, adjustment of the cylinder 56 (Fig. l) in the axial direction of the drill l is achieved by pivotal adjustment of the fork 55 in relation to the column 52, the fork being secured in adjusted position by the clamp 54.

The perspective view of Fig. 3 shows the relative positions of the different parts of the apparatus during the actual engagement of the lapping wheel 56 with the drill l. The timing of the cams 48 and 49 is such that the diamond iustable supporting member for said rotatable abrasive medium is applied tothe contoured drilling point of a drill comprising a rotatable drill, means to rotate said drill from a main drive of the machine, a work-supporting memsupport 9 is first retracted, then the lapping wheel 56 is advanced to perform the re-shaping operation, the lapping wheel 56 is then withdrawn and finally the diamond support 9 is released again so that it can advance into the position in which the normal oscillatory movement for the drilling operation is derived from the cam 28.

In the apparatus as shown in the accompanying drawings the arrangement of the drill 'l and of the diamond support 9 and its mount 7 I! in relation to the main frame of the machine, is in accordance with existing arrangements. It is,

therefore, apparent that an existing machine can readily be modified by the provision of the cam shaft 44 and the lever mechanism associated therewith for retracting the diamond support and for advancing the lapping cylinder. The arrangement for oscillating the diamond sup port as described and shown'is particularly advantageous in a machine according to the present invention, as it enables the same lever which operates the oscillatory movement to be used for the retraction which is necessary for the reshaping operation. In existing machines, however, it might be preferred to retain existing 1 mechanisms for performing the oscillatory movement and to utilize only that part of the mechanism shown which serves for the retraction of the diamond support and for the control of the lapping cylinder.

We claim:

1. A drilling machine of the type in whichan abrasive medium is applied to the contoured drilling point of a drill, comprising a rotatable drill, means to-rotate said drill from a main drive of the machine, a work-supporting member arranged in alignmentwith the axis of the drill,

means actuated by the main drive for reciprocating said work-supporting member axially of, the drill during the drilling of the work, a rotatable shaping tool for refinishing the point of said. drill, and means for retracting the. work-support ing member along the axis of the said drill from, the drilling position and simultaneously disen-' gaging the work-supporting. member from the said reciprocating means and advancing the said rotatable reshaping tool into engagement-with} the drill, said means comprising a cam eleriieh rotated by the main driY st rocking leveractu ated by said cam element. and coupled jh work-supporting member and controlling... the,

position of said work-supporting member inde pendent of said-reciprocating means, and aniad reciprocate said work-supporting member'axialber arranged in alignment with the axis of the drill, means actuated by the main drive and including a rocking element for reciprocating said work-supporting member axially of the drill during the drilling of the work, a rotatable shaping 'tool for refinishing the point of said drill, a cam shaft, 2. pair of cams on said shaft; means for driving the cam shaft from the main drive of the machine, a follower cooperating with one of said cams, a lever actuated by said follower for displacing said rocking element of said worksupporting member reciprocatingv means, a second follower cooperating with the other of said cams to advance said shaping tool into engagement with the drill during the displacement of the work support by the said rocking element, and means for driving said shaping tool.

3. A drilling machine of the type in which an abrasive medium is applied to the contoured drilling point of a drill, comprising a rotatable drill, means to rotate said drill from a main drive of the machine, a work-supporting member in alignment with the axis of the drill, means to reciprocate said work-supporting member axially of the drill during the drilling, said means comprising a spring member for displacing said work supporting membertowards the drill, a rocking element in engagement with said work-supporting member for moving said work-supportin member against thespring action, and a cam driven from the main drive of the machine and engaging said rocking element, a rotatable shaping tool for refinishing the point of said drill, a cam shaft, a pair of cams on said shaft, means for driving the cam shaft from the main drive of the machine,a follower cooperating with one of said cams and displacing the said rocking element from the cam reciprocating the said worksupporting member, a second follower cooperating with the other of said cams to advance said shaping tool into engagement with the drill when the work-supporting member is displaced by the said rocking element, and means for driving saidshaping tool. I Q

4. A drilling machine of the type in which an abrasive medium is applied to the contoured drilling point of a drill, comprising a'rotatable drill. means" to rotate said drill from a main Q drive of the machine, a work-supporting member in alignment with the axis of the drill, meansto ly of the drill during the drillin8',- said means comprising a spring member for displacing said work-supporting member towards the drill, a'- rocking element in engagement with said work- If supporting member for moving said work-sup; porting member against the spring action, and a cam driven tromthe main drive of the machine and engaging said rockingele'ment; adrill reshaping tool comprising, a grindingcylinder ad-J 'iustablggmmmtediwithitaaxis in-a plane at "right angles torthei axi's" of drill. a cam" shaft, a pair,ftifilbarrier-mi"saidshaft, means for drivin the -ow shaftfrom'the-main drive of the machine follower-cooperating. with one of said d-jdisplacing the said rocking element fromthe cam reciprocating the said work-supporting member, a second follower cooperating with the other 0! said came to advance said shapins tool into engagement with the drill when the work-supporting member is displaced by the said rocking element, and means for driving said shaping tool.

5. Ina drilling machine having a'work sup port reciprocatedi by a cam and a lever pivoted perpendicular to the axis of the cam. means for varying the length and end positions of the stroke of the lever comprising a. hinge member having an end pivoted on the lever at a point intermediate the ends of the lever and at right angles to the pivot of the lever, an adjusting screw passing through the lever and engaging the hinge' member for adjusting the angle between the lever and the hinge membenend an adjusting REFERENCES CITED The following references are of record in the 0 file of this patent:

UNITED STATES PATENTS.

Number Name Date 2,332,609 Simons Oct. 26, 1943 1,928,440 Simons Sept. 26, 1933 Simons Oct. 13, 1942 

